/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ScrollView;

/**
 * Demonstrates how a well behaved view with internal selection (
 * {@link InternalSelectionView}) can cause its parent
 * {@link android.widget.ScrollView} to scroll to keep the internally
 * interesting rectangle on the screen.
 * 
 * {@link InternalSelectionView} achieves this by calling
 * {@link android.view.View#requestRectangleOnScreen} each time its internal
 * selection changes.
 * 
 * {@link android.widget.ScrollView}, in turn, implements
 * {@link android.view.View#requestRectangleOnScreen} thereby acheiving the
 * result. Note that {@link android.widget.ListView} also implements the method,
 * so views that call {@link android.view.View#requestRectangleOnScreen} that
 * are embedded within either {@link android.widget.ScrollView}s or
 * {@link android.widget.ListView}s can expect to keep their internal
 * interesting rectangle visible.
 */
public class InternalSelectionScroll extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		ScrollView sv = new ScrollView(this);
		ViewGroup.LayoutParams svLp = new ScrollView.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.WRAP_CONTENT);

		LinearLayout ll = new LinearLayout(this);
		ll.setLayoutParams(svLp);
		sv.addView(ll);

		InternalSelectionView isv = new InternalSelectionView(this, 10);
		int screenHeight = getWindowManager().getDefaultDisplay().getHeight();
		LinearLayout.LayoutParams llLp = new LinearLayout.LayoutParams(
				ViewGroup.LayoutParams.MATCH_PARENT, 2 * screenHeight); // 2x
																		// screen
																		// height
																		// to
																		// ensure
																		// scrolling
		isv.setLayoutParams(llLp);
		ll.addView(isv);

		setContentView(sv);
	}
}
